In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size
International audience Abstract. Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard o...
Published in: | Climate of the Past |
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Main Authors: | , , , , , , , , , , , , , , |
Other Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.inrae.fr/hal-03325232 https://hal.inrae.fr/hal-03325232/document https://hal.inrae.fr/hal-03325232/file/cp-17-419-2021.pdf https://doi.org/10.5194/cp-17-419-2021 |
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Portail HAL-ANR (Agence Nationale de la Recherche) |
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English |
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[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology |
spellingShingle |
[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology Young, Nicolás Lesnek, Alia Cuzzone, Josh Briner, Jason Badgeley, Jessica Balter-Kennedy, Alexandra Graham, Brandon Cluett, Allison Lamp, Jennifer Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc Zimmerman, Susan Schaefer, Joerg In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
topic_facet |
[SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology |
description |
International audience Abstract. Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard of its current position remains challenging. Contemporary retreat of the GrIS from its historical maximum extent in southwestern Greenland is exposing a landscape that holds clues regarding the configuration and timing of past ice-sheet minima. To quantify the duration of the time the GrIS margin was near its modern extent we develop a new technique for Greenland that utilizes in situ cosmogenic 10Be–14C–26Al in bedrock samples that have become ice-free only in the last few decades due to the retreating ice-sheet margin at Kangiata Nunaata Sermia (n=12 sites, 36 measurements; KNS), southwest Greenland. To maximize the utility of this approach, we refine the deglaciation history of the region with stand-alone 10Be measurements (n=49) and traditional 14C ages from sedimentary deposits contained in proglacial–threshold lakes. We combine our reconstructed ice-margin history in the KNS region with additional geologic records from southwestern Greenland and recent model simulations of GrIS change to constrain the timing of the GrIS minimum in southwest Greenland and the magnitude of Holocene inland GrIS retreat, as well as to explore the regional climate history influencing Holocene ice-sheet behavior. Our 10Be–14C–26Al measurements reveal that (1) KNS retreated behind its modern margin just before 10 ka, but it likely stabilized near the present GrIS margin for several thousand years before retreating farther inland, and (2) pre-Holocene 10Be detected in several of our sample sites is most easily explained by several thousand years of surface exposure during the last interglaciation. Moreover, our new results indicate that the minimum extent of the GrIS likely occurred after ∼5 ka, and the GrIS margin may have approached ... |
author2 |
Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Collège de France - Chaire Evolution du climat et de l'océan Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ANR-17-CE01-0001,CARBOTRYDH,Etude à haute résolution du radiocarbone des séries d'anneaux d'arbres des Alpes du Sud pour le Dryas Récent et l'Holocène: Une fenêtre sur le passé pour comprendre les variations rapides du cycle du carbone et de l'activité solaire(2017) |
format |
Article in Journal/Newspaper |
author |
Young, Nicolás Lesnek, Alia Cuzzone, Josh Briner, Jason Badgeley, Jessica Balter-Kennedy, Alexandra Graham, Brandon Cluett, Allison Lamp, Jennifer Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc Zimmerman, Susan Schaefer, Joerg |
author_facet |
Young, Nicolás Lesnek, Alia Cuzzone, Josh Briner, Jason Badgeley, Jessica Balter-Kennedy, Alexandra Graham, Brandon Cluett, Allison Lamp, Jennifer Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc Zimmerman, Susan Schaefer, Joerg |
author_sort |
Young, Nicolás |
title |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_short |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_full |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_fullStr |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_full_unstemmed |
In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size |
title_sort |
in situ cosmogenic 10be–14c–26al measurements from recently deglaciated bedrock as a new tool to decipher changes in greenland ice sheet size |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.inrae.fr/hal-03325232 https://hal.inrae.fr/hal-03325232/document https://hal.inrae.fr/hal-03325232/file/cp-17-419-2021.pdf https://doi.org/10.5194/cp-17-419-2021 |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.inrae.fr/hal-03325232 Climate of the Past, 2021, 17 (1), pp.419-450. ⟨10.5194/cp-17-419-2021⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-419-2021 hal-03325232 https://hal.inrae.fr/hal-03325232 https://hal.inrae.fr/hal-03325232/document https://hal.inrae.fr/hal-03325232/file/cp-17-419-2021.pdf doi:10.5194/cp-17-419-2021 WOS: 000620883400001 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-17-419-2021 |
container_title |
Climate of the Past |
container_volume |
17 |
container_issue |
1 |
container_start_page |
419 |
op_container_end_page |
450 |
_version_ |
1810446110493245440 |
spelling |
ftanrparis:oai:HAL:hal-03325232v1 2024-09-15T18:08:44+00:00 In situ cosmogenic 10Be–14C–26Al measurements from recently deglaciated bedrock as a new tool to decipher changes in Greenland Ice Sheet size Young, Nicolás Lesnek, Alia Cuzzone, Josh Briner, Jason Badgeley, Jessica Balter-Kennedy, Alexandra Graham, Brandon Cluett, Allison Lamp, Jennifer Schwartz, Roseanne Tuna, Thibaut Bard, Edouard Caffee, Marc Zimmerman, Susan Schaefer, Joerg Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Collège de France - Chaire Evolution du climat et de l'océan Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut de Recherche pour le Développement (IRD)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) ANR-17-CE01-0001,CARBOTRYDH,Etude à haute résolution du radiocarbone des séries d'anneaux d'arbres des Alpes du Sud pour le Dryas Récent et l'Holocène: Une fenêtre sur le passé pour comprendre les variations rapides du cycle du carbone et de l'activité solaire(2017) 2021 https://hal.inrae.fr/hal-03325232 https://hal.inrae.fr/hal-03325232/document https://hal.inrae.fr/hal-03325232/file/cp-17-419-2021.pdf https://doi.org/10.5194/cp-17-419-2021 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-17-419-2021 hal-03325232 https://hal.inrae.fr/hal-03325232 https://hal.inrae.fr/hal-03325232/document https://hal.inrae.fr/hal-03325232/file/cp-17-419-2021.pdf doi:10.5194/cp-17-419-2021 WOS: 000620883400001 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.inrae.fr/hal-03325232 Climate of the Past, 2021, 17 (1), pp.419-450. ⟨10.5194/cp-17-419-2021⟩ [SDU.STU.ME]Sciences of the Universe [physics]/Earth Sciences/Meteorology [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology info:eu-repo/semantics/article Journal articles 2021 ftanrparis https://doi.org/10.5194/cp-17-419-2021 2024-07-12T11:06:32Z International audience Abstract. Sometime during the middle to late Holocene (8.2 ka to ∼ 1850–1900 CE), the Greenland Ice Sheet (GrIS) was smaller than its current configuration. Determining the exact dimensions of the Holocene ice-sheet minimum and the duration that the ice margin rested inboard of its current position remains challenging. Contemporary retreat of the GrIS from its historical maximum extent in southwestern Greenland is exposing a landscape that holds clues regarding the configuration and timing of past ice-sheet minima. To quantify the duration of the time the GrIS margin was near its modern extent we develop a new technique for Greenland that utilizes in situ cosmogenic 10Be–14C–26Al in bedrock samples that have become ice-free only in the last few decades due to the retreating ice-sheet margin at Kangiata Nunaata Sermia (n=12 sites, 36 measurements; KNS), southwest Greenland. To maximize the utility of this approach, we refine the deglaciation history of the region with stand-alone 10Be measurements (n=49) and traditional 14C ages from sedimentary deposits contained in proglacial–threshold lakes. We combine our reconstructed ice-margin history in the KNS region with additional geologic records from southwestern Greenland and recent model simulations of GrIS change to constrain the timing of the GrIS minimum in southwest Greenland and the magnitude of Holocene inland GrIS retreat, as well as to explore the regional climate history influencing Holocene ice-sheet behavior. Our 10Be–14C–26Al measurements reveal that (1) KNS retreated behind its modern margin just before 10 ka, but it likely stabilized near the present GrIS margin for several thousand years before retreating farther inland, and (2) pre-Holocene 10Be detected in several of our sample sites is most easily explained by several thousand years of surface exposure during the last interglaciation. Moreover, our new results indicate that the minimum extent of the GrIS likely occurred after ∼5 ka, and the GrIS margin may have approached ... Article in Journal/Newspaper Greenland Ice Sheet Portail HAL-ANR (Agence Nationale de la Recherche) Climate of the Past 17 1 419 450 |